[NTG-context] Bug with complex contextual opentype feature
Hello All,
I’ve recently been experimenting with contextual features in EB Garamond
and LuaTeX’s output is puzzling. As a showcase, I tried to implement the
famous TeX logos with opentype. This is realized in a feature xtex
with GSUB and GPOS lookup tables for substituting some glyphs and for
positioning them horizontally and vertically:
# OT feature code for TeX logos
lookup xtex_sub1 {
sub X e' T e X by e.xtex2; # e.xtex2 is a reversed copy of E
sub X e' L a T e X by e.xtex2;
sub L a' T e X by a.sc;
sub T e' X by e.xtex1; # e.xtex1 is a copy of E
sub L a.sc T e.xtex1 X [two two.lnum two.taboldstyle two.tablining]
e' by e.xtex3; # e.xtex3 is a copy of epsilon
} xtex_sub1;
lookup xtex_pos1 {
pos X e.xtex2' -130 -180 -320 0 T;
pos X e.xtex2' -130 -180 -200 0 L;
pos X [two two.lnum two.taboldstyle two.tablining] e.xtex3' 0 -180
0 0;
pos L a.sc' -330 210 -490 0 T e.xtex1 X;
pos T e.xtex1' -180 -180 -280 0 X;
}xtex_pos1;
feature xtex {
lookup xtex_sub1;
lookup xtex_pos1;
} xtex;
#
LuaTeX only processes the sequence XeTeX where it substitutes the
first e by e.xtex1 instead of e.xtex2. Then it positions it with
respect to X but not to T. All the other parts of the lookups are
ignored as well. The font file can be downloaded from
http://www.georgduffner.at/ebgaramond/fonts/EBGaramond12-Regular.otf.
The expected output can be seen at the bottom of this page:
http://www.georgduffner.at/ebgaramond/design.html with Firefox and
Chrome/Chromium and in the attached screenshot (from SortsmillEditor).
Like the browsers, XeLaTeX’s output is correct. My LuaTeX and ConTeXt
versions are:
This is LuaTeX, Version beta-0.79.1 (TeX Live 2014/dev) (rev 4972)
ConTeXt ver: 2014.07.17 13:24 MKIV beta fmt: 2014.7.17 int:
english/english
% ConTeXt test
\definefontfeature[xtex] [default][xtex=yes]
\definefontsynonym[ebg][file:EBGaramond12-Regular.otf]
\def\sample{XeTeX LuaLaTeX XeLaTeX TeX LaTeX2e}
\definefontfeature
[experiment]
[default]
[xtex=yes]
\usemodule[fnt-20]
\usemodule[art-01]
\setupbodyfont[dejavu]
\starttext
\startTEXpage
\hbox{{\definedfont[ebg*defaultat 12pt]\sample}
{\definedfont[ebg*default at 12pt]\sample}}\par
\hbox{{\definedfont[ebg*xtex at 12pt]\sample}
{\definedfont[ebg*default at 12pt]\feature[+][xtex]\sample}}\par
\stopTEXpage
\def\sample{XeTeX LuaLaTeX XeLaTeX TeX LaTeX2e}
\setvariables
[otftracker]
[font=file:EBGaramond12-Regular.otf,
size=24pt,
features=experiment,
title=Feature Check,
sample=\sample]
\stoptext
%
Best regards,
Georg
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
Re: [NTG-context] \head: broken?
Thanks. I think I could have figured out that one myself. I guess it's my own head a bit broken atm... But I should mention that the contextgarden article mentions only one option for \startitemize, perhaps that is why I got misleaded there. (http://wiki.contextgarden.net/Command/startitemize) Greetings, Rob You cant mix keywords and assignment in the same argument of a setup-command, e.g. \staritemize[packed,headstyle=bold] but some commands have multiple arguments which you use for both types, e.g. \startitemize[packed][headstyle=bold] BTW: A minimal example should be compilable (i.e. you need \starttext and \stoptext) which isnt the case with your example. Wolfgang ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___ ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
[NTG-context] Fonthandling/protrusion question: handling of left margin
Short question about the font feature protrusion. This handles certain characters that get shifted into the right margin to make a more visable straight right margin. But can this font feature also handle left margin? For example, sentences that start in the left margin and begin with a quotation, there you would want the same effect also in the left margin. I currently use \kern-1ex to achieve the same effect for a sentence that commences on the left margin and starts with a quotation. Greetings, Rob ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Bug with complex contextual opentype feature
On 7/18/2014 12:03 PM, Georg Duffner wrote:
Hello All,
I’ve recently been experimenting with contextual features in EB Garamond
and LuaTeX’s output is puzzling. As a showcase, I tried to implement the
famous TeX logos with opentype. This is realized in a feature xtex
with GSUB and GPOS lookup tables for substituting some glyphs and for
positioning them horizontally and vertically:
# OT feature code for TeX logos
lookup xtex_sub1 {
sub X e' T e X by e.xtex2; # e.xtex2 is a reversed copy of E
sub X e' L a T e X by e.xtex2;
sub L a' T e X by a.sc;
sub T e' X by e.xtex1; # e.xtex1 is a copy of E
sub L a.sc T e.xtex1 X [two two.lnum two.taboldstyle two.tablining]
e' by e.xtex3; # e.xtex3 is a copy of epsilon
} xtex_sub1;
lookup xtex_pos1 {
pos X e.xtex2' -130 -180 -320 0 T;
pos X e.xtex2' -130 -180 -200 0 L;
pos X [two two.lnum two.taboldstyle two.tablining] e.xtex3' 0 -180
0 0;
pos L a.sc' -330 210 -490 0 T e.xtex1 X;
pos T e.xtex1' -180 -180 -280 0 X;
}xtex_pos1;
feature xtex {
lookup xtex_sub1;
lookup xtex_pos1;
} xtex;
#
LuaTeX only processes the sequence XeTeX where it substitutes the
first e by e.xtex1 instead of e.xtex2. Then it positions it with
respect to X but not to T. All the other parts of the lookups are
ignored as well. The font file can be downloaded from
http://www.georgduffner.at/ebgaramond/fonts/EBGaramond12-Regular.otf.
The expected output can be seen at the bottom of this page:
http://www.georgduffner.at/ebgaramond/design.html with Firefox and
Chrome/Chromium and in the attached screenshot (from SortsmillEditor).
Like the browsers, XeLaTeX’s output is correct. My LuaTeX and ConTeXt
versions are:
This is LuaTeX, Version beta-0.79.1 (TeX Live 2014/dev) (rev 4972)
ConTeXt ver: 2014.07.17 13:24 MKIV beta fmt: 2014.7.17 int:
english/english
% ConTeXt test
\definefontfeature[xtex] [default][xtex=yes]
\definefontsynonym[ebg][file:EBGaramond12-Regular.otf]
\def\sample{XeTeX LuaLaTeX XeLaTeX TeX LaTeX2e}
\definefontfeature
[experiment]
[default]
[xtex=yes]
\usemodule[fnt-20]
\usemodule[art-01]
\setupbodyfont[dejavu]
\starttext
\startTEXpage
\hbox{{\definedfont[ebg*defaultat 12pt]\sample}
{\definedfont[ebg*default at 12pt]\sample}}\par
\hbox{{\definedfont[ebg*xtex at 12pt]\sample}
{\definedfont[ebg*default at 12pt]\feature[+][xtex]\sample}}\par
\stopTEXpage
\def\sample{XeTeX LuaLaTeX XeLaTeX TeX LaTeX2e}
\setvariables
[otftracker]
[font=file:EBGaramond12-Regular.otf,
size=24pt,
features=experiment,
title=Feature Check,
sample=\sample]
\stoptext
%
fixed
(back and fore were swapped - at some point i merged two handlers as
there is no conceptual difference between before/current/after and
fore/names/back apart from some efficiency in the otf file)
thanks for noticing,
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
Re: [NTG-context] question about unwanted locations of pagebreaks
On 7/18/2014 1:27 PM, Rob Heusdens wrote: The very last thing to do when finalizing a multi-page document is checking where the page breaks occur, and make corrections accordingly, if the pagebreak occurs at a location you do not want. Of course, you can take all kind of measures on before hand to avoid 'bad' places, like avoiding pagebreaks directly after a new section and before any of the body text, etc. But the degrees of freedom for context to handle this and to avoid (typographically) 'bad' pagebreak locations are I suppose limited. Is there a way (already implemented) in Context in which one can add some degrees of freedom to avoid bad pagebreak locations. For instance with elements that can vertically stretch (between some minimum and maximum value) and can be placed optionally (and which could for instance include a fancy decoration, like fancybreak module provides)? (I guess this is also the way in which typesetters in the past dealt with this problem). you can play with this (rather old) feature: \adaptlayout[height=5mm] \adaptlayout[lines=2] \adaptlayout[123][height=5mm] \adaptlayout[5,9,42][lines=2] Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Fonthandling/protrusion question: handling of left margin
On 7/18/2014 1:11 PM, Rob Heusdens wrote: Short question about the font feature protrusion. This handles certain characters that get shifted into the right margin to make a more visable straight right margin. But can this font feature also handle left margin? For example, sentences that start in the left margin and begin with a quotation, there you would want the same effect also in the left margin. I currently use \kern-1ex to achieve the same effect for a sentence that commences on the left margin and starts with a quotation. \setupfontprotrusion[mine][vector=quality,right=10,left=40] \definefontfeature[default][default][protrusion=mine] \setupalign[hanging] \showframe \starttext \input tufte \stoptext ... wondering why only the first and last line Hans - Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl - ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
Re: [NTG-context] Fonthandling/protrusion question: handling of left margin
Am 18.07.2014 um 14:57 schrieb Hans Hagen pra...@wxs.nl:
On 7/18/2014 2:52 PM, Wolfgang Schuster wrote:
Am 18.07.2014 um 14:37 schrieb Hans Hagen pra...@wxs.nl:
On 7/18/2014 1:11 PM, Rob Heusdens wrote:
Short question about the font feature protrusion. This handles certain
characters that get shifted into the right margin to make a more visable
straight right margin. But can this font feature also handle left margin?
For example, sentences that start in the left margin and begin with a
quotation, there you would want the same effect also in the left margin.
I currently use \kern-1ex to achieve the same effect for a sentence that
commences on the left margin and starts with a quotation.
\setupfontprotrusion[mine][vector=quality,right=10,left=40]
\definefontfeature[default][default][protrusion=mine]
\setupalign[hanging]
\showframe
\starttext
\input tufte
\stoptext
... wondering why only the first and last line
On the first and last line are shifted because you don’t have protrusion
values for letters
at the begin of the other lines as can be seen in this table (from
font-ext.lua):
vectors['alpha'] = {
[byte(A)] = { .05, .05 },
[byte(F)] = { 0, .05 },
[byte(J)] = { .05, 0 },
[byte(K)] = { 0, .05 },
[byte(L)] = { 0, .05 },
[byte(T)] = { .05, .05 },
[byte(V)] = { .05, .05 },
[byte(W)] = { .05, .05 },
[byte(X)] = { .05, .05 },
[byte(Y)] = { .05, .05 },
[byte(k)] = { 0, .05 },
[byte(r)] = { 0, .05 },
[byte(t)] = { 0, .05 },
[byte(v)] = { .05, .05 },
[byte(w)] = { .05, .05 },
[byte(x)] = { .05, .05 },
[byte(y)] = { .05, .05 },
}
ah, yes, those tables are probably flushed from my memory by now
BTW, is it intended that protrusion doesn’t work for indented lines?
\setupfontprotrusion[mine][vector=punctuation,left=2]
\definefontfeature[default][default][protrusion=mine]
\setupalign[hanging]
\starttext
“Text”
Text
\blank \setupindenting[yes,medium]
“Text”
Text
\stoptext
Wolfgang
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
Re: [NTG-context] Fonthandling/protrusion question: handling of left margin
On 7/18/2014 3:10 PM, Wolfgang Schuster wrote:
Am 18.07.2014 um 14:57 schrieb Hans Hagen pra...@wxs.nl:
On 7/18/2014 2:52 PM, Wolfgang Schuster wrote:
Am 18.07.2014 um 14:37 schrieb Hans Hagen pra...@wxs.nl:
On 7/18/2014 1:11 PM, Rob Heusdens wrote:
Short question about the font feature protrusion. This handles certain
characters that get shifted into the right margin to make a more visable
straight right margin. But can this font feature also handle left margin?
For example, sentences that start in the left margin and begin with a
quotation, there you would want the same effect also in the left margin.
I currently use \kern-1ex to achieve the same effect for a sentence that
commences on the left margin and starts with a quotation.
\setupfontprotrusion[mine][vector=quality,right=10,left=40]
\definefontfeature[default][default][protrusion=mine]
\setupalign[hanging]
\showframe
\starttext
\input tufte
\stoptext
... wondering why only the first and last line
On the first and last line are shifted because you don’t have protrusion values
for letters
at the begin of the other lines as can be seen in this table (from
font-ext.lua):
vectors['alpha'] = {
[byte(A)] = { .05, .05 },
[byte(F)] = { 0, .05 },
[byte(J)] = { .05, 0 },
[byte(K)] = { 0, .05 },
[byte(L)] = { 0, .05 },
[byte(T)] = { .05, .05 },
[byte(V)] = { .05, .05 },
[byte(W)] = { .05, .05 },
[byte(X)] = { .05, .05 },
[byte(Y)] = { .05, .05 },
[byte(k)] = { 0, .05 },
[byte(r)] = { 0, .05 },
[byte(t)] = { 0, .05 },
[byte(v)] = { .05, .05 },
[byte(w)] = { .05, .05 },
[byte(x)] = { .05, .05 },
[byte(y)] = { .05, .05 },
}
ah, yes, those tables are probably flushed from my memory by now
BTW, is it intended that protrusion doesn’t work for indented lines?
\setupfontprotrusion[mine][vector=punctuation,left=2]
\definefontfeature[default][default][protrusion=mine]
\setupalign[hanging]
\starttext
“Text”
Text
\blank \setupindenting[yes,medium]
“Text”
Text
\stoptext
probably intended (not sure about hanging)
Hans
-
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
| www.pragma-pod.nl
-
___
If your question is of interest to others as well, please add an entry to the
Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://tex.aanhet.net
archive : http://foundry.supelec.fr/projects/contextrev/
wiki : http://contextgarden.net
___
Re: [NTG-context] Fonthandling/protrusion question: handling of left margin
On 2014-07-18 Hans Hagen wrote: On 7/18/2014 3:10 PM, Wolfgang Schuster wrote: BTW, is it intended that protrusion doesn't work for indented lines? \setupfontprotrusion[mine][vector=punctuation,left=2] \definefontfeature[default][default][protrusion=mine] \setupalign[hanging] \starttext Text Text \blank \setupindenting[yes,medium] Text Text \stoptext probably intended (not sure about hanging) I've reported something related some time ago: http://tracker.luatex.org/view.php?id=884 Jan ___ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___
